Spring seat



E. E. HEWITT Jan. 16, 1934.

SPRING SEAT Filed May 11. 1932 Fi.f 231 21, 53

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ELLIS E. i-iEVViTT Patented Jan. 16, 1934 1,943,670

: UNITED STATES" PATENT OFFICE SPRING SEAT Ellis- E. Hewitt, Edgewood,Pa., assignor to The -Westinghouse Air Brake; Company, Wilmerding,P'a.,. a corporation of Pennsylvania.

Application May 11, 1932; Serial No. 610,521-

1 Claim. (01. 251 144).

This invention relates to fluid brake equipment Referring to the drawingand particularly to and particularly to control. and check valve de-Figs. 1, 2 and 3, the check valve structure com.- vi'oes such as areemployed in fluid. brake cnprises a casing 11 having a chamber 12'therein trolling, valve devices. through which fluid under pressure isadapted An object of the invention is to provide a valve to flow andwhich communicates with a pas- 60'" device whereinthe valve. spring isreleasably resage 13. The casing, is provided with a bore I4 tainedwithin. a valve chamber by a simple ineX- in which a valve seat bushing15 is pressed, the pensive retainer that may readily be inserted bushingbeing provided with an annular seat rib through the mouth of the chamberand moved 16 surrounding. the opening 17' in the bushing into engagementwith the valve casing for rethrough which fluid may fiow from a chamber18 65 leasably retaining thespring in. assembled posito the chamber 12.tioni The casing 11 is also provided with a bore 19 A further objectofthe invention is to proin which a valve guide bushing 21. is pressedand vide a valve device and spring retainer therefor, which serves tosupport and guide a check valve having the above noted characteristicswherein 22 that is provided with a fibre, rubber or, com- 70' theretainer serves to support and center the position seat disc 23 that isretained in posispring and. is of greater length than the diameter tionupon the valve body by a screw 24 that is' of the mouth of the valvechamber and may be threaded into a threaded opening 25 in the valveplaced-across the mouth after it is inserted end- 22. The valve body is.provided. with a cylindriwise therethrough, for engaging a. wall of thecal flanged portion 26 that is. slidably fitted into 75" valve casingand for supporting said spring withthe bushing 21. in the chamber. Thechamber 12 is provided with an enlarged A further object of theinvention is to provide undercut portion 27 adjacent the mouth 28. of a.valve device and spring retainer therefor. the chamber defined by anannular lip. 29, the wherein the valve and spring may be assembled.diameter of the mouth being less than that of 80 within a chamber in thevalve casing and rethe undercut portion. 27. of the recess, asindileasably retained in operative assembled position, cated in Figs. 1and 2. so that the valve device. may be handled as a The valve 22. isyieldingly urged into engageunit and the parts retained in assembledposiment with the seat rib 16 by a spring 31 that is tion while the unitis being. attached to a. supinterposed between and engages the valve 2285 port for said valve device. and a retainer 33 that is provided with.a recess 7 These and other objects of the invention that 3 L whichserves to support and center the spring will be made apparent throughoutthe further .31. The body of the retainer 33 is slightly lessdescription thereof are attained by means of the in. diameter than themouth 28' of the chamber 35 apparatus. hereinafter described andillustrated 12 and is provided with two diametrically oppoin theaccompanying draw wherein site extensions or. lugs 35 that extendradially 1 1S: a 5e 1t10na1 VIEW 0f 011801} Valve beyond the peripheryof the re-tainerand which V108. embodylng features of my lnventlonl mayengage the inner face 36 of the lip 29 for 40 simi1ar View of the Valvedevice preventing outward movement of the. retainer. shown m "*it t themgthod of assembly The retainer is yieldingly heldv in retaining posihsptmg re amer tion shown in Fig. 1 by the tension of the spring 3transverse sgctwnal VIEW 31. The spring therefore serves to hold themelevatlon'taken on the hne 33 of 1 and retainer in operative positionand to yieldingly showing the spring retainer; 45 Fig. 4 is a sectionalview through a control r the Valve Into engagement wlth the Seat valvedevice embodying features of my invennb tion and showing a difi d f r fSpring When the fluid pressure wlthin the chamber 18 exceeds that withinthe chamber 12 suflitainer;

Fig. 5 is a similar view of the device shown in c ently to overcome thepr 1113011 t e ne 50 Fig. 4, showing the method of assembly of thespring retainer; and the right, away from the seat rib 16, and per Fig.6 is a transverse sectional view of the mits fluid to flow from thechamber 18 to the device shown in Fig. 4, taken on the line 66 chamber12 and from thence to the passage 13. thereof and showing the modifiedform of spring The valve, 22 is provided with a passage 37 5 retainersin elevation.

face of the valve 22, the valve is forced toward 10 5 through whichfluid may fiow in order to balance the fluid pressure on both sides ofthe valve.

To assemble the valve device, the seat disc 23 is first fastened to thevalve 22 by means of the screw 24 and the valve is then inserted in therecess into the position shown in Fig. l. The spring 31 is next insertedinto the recess and the retainer 33 is then placed in engagement withthe outer end of the spring. The retainer is next inclined. or tiltedwith respect to the mouth of the recess so that the retainer may bemoved while inclined into the recess so that the lugs 35 may passthrough the mouth 28, the retainer 33 at such time being moved into theposition shown in Fig. 2. After the lowermost lug 35 has cleared the lip29 the retainer may be moved to the position shown in Fig. 1, whereinthe lugs 35 engage the inner face of the lip 29 and prevent outwardmovement of the retainer. By reason of this construction, the spring isheld in operative position by a simple retainer that may be made ofpressed metal and assembled within the casing by a simple movement.

The valve device thus assembled may be handled as a unit and the partsare retained in operative position while the device is being attached toa support member 38 which serves to close the mouth of the chamber andsupport the valve casing. The valve casing may be secured to the support38 by means of bolts (not shown) Referring to Figs. 4, 5 and 6, whereina modified form of valve device and spring retainer is shown, the valvedevice comprises a casing 11 having a chamber 12 through which fluidunder pressure may flow and which communicates with a passage 13. Thecasing is provided with a bore 14 in which a valve bushing 15 ispressed, the bushing having an annular valve seat rib 16 surrounding anopening 1'7 in the bushing through which fluid may pass from the chamber18 to the chamber 12.

The casing 11 is also provided with a bore 19 in which a valve guidebushing 21 is pressed. The bushing 21 serves as a guide for a valve 22that is adapted to engage the valve seat rib l6 and close communicationbetween the chambers 18 and 12. The valve is provided with an operatingstem 20 which when moved toward the right, moves the valve 22 away fromthe seat rib and permits fluid to flow from the chamber 18 to chamber12.

The chamber 12 is provided with an enlarged undercut portion 41 adjacentthe mouth 42 of the chamber which is defined by an annular lip 43. Aspring 44 is interposed between and engages the valve 22' and a retainer45 that is oblong in shape. The end portions 46 of the retainer areoffset as indicated in Fig. 4 and are adapted to engage the inner face4'? of the lip 43 for preventing outward movement of the retainer, whichis also provided with a conical projection 48 which serves to center thespring 44 with respect to the retainer, The inner end of the spring 44is centered upon the valve 22 by a lug 49 on the outer face of the valve22'.

The assembly operations of the valve device shown in Fig. 4 are similarto the operations employed in assembling the valve device shown inFig. 1. After the valve 22 is inserted within the chamber upon theseatrib 16, the spring 44 is inserted and the retainer is placed inengagement with the outer end of the spring. The retainer is then tiltedso that the retainer may be moved into the recess into the positionshown in Fig. 5. Since the major axis of the retainer is longer than thediameter of the mouth 42 of the chamber, the ends 46 of the retainerengage the inner face of the lip 43 when the retainer is disposed normalto the axis of the chamber and prevents outward movement of theretainer.

By reason of this construction, the valve device may be assembled as aunit and the parts retained in operative position while the valve deviceis being handled and connected to the supporting structure 51 whichserves as 'a closure for the mouth 42 of the chamber. When the valve isopen, fluid under pressure may flow from the chamber 18 through theopening 17 in the bushing 15, into the chamber 12 and thence past theperiphery of the valve 22 to the portion of the chamber 12 on the rightside of the valve to the passage 13, Fig. 6.

While I have shown but two embodiments of the invention, it is obviousthat changes, omissions and additions may be made in the con structionwithout departing from the spirit of the invention.

Having now described my invention, what 1 claim as new and desire tosecure by Letters Patent, is:

A valve device comprising a casing having an undercut chamber throughwhich fluid under pressure is adapted to flow and having a continuousannular retaining seat adjacent the mouth of the chamber, a valve seatin said chamber, a valve for said seat, a retainer having a major axislonger than the diameter of the mouth of the chamber and a minor axisshorter than said diameter permitting insertion of the retainer throughsaid mouth when the retainer is tilted toward the longitudinal axis ofthe chamber, the said retainer having means at the ends of its majoraxis for engaging the retain ing seat adjacent said mouth when theretainer is in a plane normal to the axis of said chamber for preventingoutward movement of said retainer, and a spring interposed between andengaging said valve and said retainer for yieldingly retaining theretainer in operative position, the said retainer having means fittinginto the mouth of the chamber and cooperating therewith for centeringthe retainer and having means cooperating with said spring for centeringit with respect to the retainer.

ELLIS E. HEWITT.

